// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder

#include "../common/mmo.h"
#include "../common/showmsg.h"
#include "../common/malloc.h"
#include "../common/strlib.h"
#include "../common/db.h"
#include "mapindex.h"

#include <string.h>
#include <stdio.h>
#include <stdlib.h>

DBMap *mapindex_db;
struct _indexes {
	char name[MAP_NAME_LENGTH]; //Stores map name
} indexes[MAX_MAPINDEX];

int max_index = 0;

char mapindex_cfgfile[80] = "db/map_index.txt";

#define mapindex_exists(id) (indexes[id].name[0] != '\0')
/// Retrieves the map name from 'string' (removing .gat extension if present).
/// Result gets placed either into 'buf' or in a static local buffer.
const char *mapindex_getmapname(const char *string, char *output) {
	static char buf[MAP_NAME_LENGTH];
	char *dest = (output != NULL) ? output : buf;
	
	size_t len = strnlen(string, MAP_NAME_LENGTH_EXT);
	if (len == MAP_NAME_LENGTH_EXT) {
		ShowWarning("(mapindex_normalize_name) Map name '%*s' is too long!\n", 2*MAP_NAME_LENGTH_EXT, string);
		len--;
	}
	if (len >= 4 && stricmp(&string[len-4], ".gat") == 0)
		len -= 4; // strip .gat extension
	
	len = min(len, MAP_NAME_LENGTH-1);
	safestrncpy(dest, string, len+1);
	memset(&dest[len], '\0', MAP_NAME_LENGTH-len);
	
	return dest;
}

/// Retrieves the map name from 'string' (adding .gat extension if not already present).
/// Result gets placed either into 'buf' or in a static local buffer.
const char *mapindex_getmapname_ext(const char *string, char *output) {
	static char buf[MAP_NAME_LENGTH_EXT];
	char *dest = (output != NULL) ? output : buf;

	size_t len;

	strcpy(buf, string);
	sscanf(string, "%*[^#]%*[#]%15s", buf);

	len = safestrnlen(buf, MAP_NAME_LENGTH);

	if (len == MAP_NAME_LENGTH) {
		ShowWarning("(mapindex_normalize_name) Map name '%*s' is too long!\n", 2*MAP_NAME_LENGTH, buf);
		len--;
	}
	safestrncpy(dest, buf, len + 1);

	if (len < 4 || stricmp(&dest[len - 4], ".gat") != 0) {
		strcpy(&dest[len], ".gat");
		len += 4; // Add .gat extension
	}

	memset(&dest[len], '\0', MAP_NAME_LENGTH_EXT-len);
	
	return dest;
}

/// Adds a map to the specified index
/// Returns 1 if successful, 0 oherwise
int mapindex_addmap(int index, const char *name) {
	char map_name[MAP_NAME_LENGTH];

	if (index == -1) // Autogive index
		ARR_FIND(1,max_index,index,(indexes[index].name[0] == '\0'));

	if (index < 0 || index >= MAX_MAPINDEX) {
		ShowError("(mapindex_add) Map index (%d) for \"%s\" out of range (max is %d)\n", index, name, MAX_MAPINDEX);
		return 0;
	}

	mapindex_getmapname(name, map_name);

	if (map_name[0] == '\0') {
		ShowError("(mapindex_add) Cannot add maps with no name.\n");
		return 0;
	}

	if (strlen(map_name) >= MAP_NAME_LENGTH) {
		ShowError("(mapindex_add) Map name %s is too long. Maps are limited to %d characters.\n", map_name, MAP_NAME_LENGTH);
		return 0;
	}

	if (mapindex_exists(index)) {
		ShowWarning("(mapindex_add) Overriding index %d: map \"%s\" -> \"%s\"\n", index, indexes[index].name, map_name);
		strdb_remove(mapindex_db, indexes[index].name);
	}

	safestrncpy(indexes[index].name, map_name, MAP_NAME_LENGTH);
	strdb_iput(mapindex_db, map_name, index);
	if (max_index <= index)
		max_index = index + 1;

	return index;
}

unsigned short mapindex_name2id_sub(const char *name, const char *func) {
	int i;
	char map_name[MAP_NAME_LENGTH];

	mapindex_getmapname(name, map_name);

	if ((i = strdb_iget(mapindex_db, map_name)))
		return i;

	ShowDebug("(%s) mapindex_name2id: Map \"%s\" not found in index list!\n", func, map_name);
	return 0;
}

const char *mapindex_id2name_sub(unsigned short id, const char *file, int line, const char *func) {
	if (id > MAX_MAPINDEX || !mapindex_exists(id)) {
		ShowDebug("(%s) mapindex_id2name: Requested name for non-existant map index [%d] in cache. %s:%d\n", func, id, file, line);
		return indexes[0].name; // dummy empty string so that the callee doesn't crash
	}
	return indexes[id].name;
}

void mapindex_init(void) {
	FILE *fp;
	char line[1024];
	int last_index = -1;
	int index;
	char map_name[MAP_NAME_LENGTH];

	if ((fp = fopen(mapindex_cfgfile, "r")) == NULL) {
		ShowFatalError("Unable to read mapindex config file %s!\n", mapindex_cfgfile);
		exit(EXIT_FAILURE); //Server can't really run without this file.
	}
	memset(&indexes, 0, sizeof(indexes));
	mapindex_db = strdb_alloc(DB_OPT_DUP_KEY, MAP_NAME_LENGTH);
	while (fgets(line, sizeof(line), fp)) {
		if (line[0] == '/' && line[1] == '/')
			continue;
		switch (sscanf(line, "%11s\t%d", map_name, &index)) {
			case 1: //Map with no ID given, auto-assign
				index = last_index + 1;
			case 2: //Map with ID given
				mapindex_addmap(index, map_name);
				break;
			default:
				continue;
		}
		last_index = index;
	}
	fclose(fp);
}

/**
 * Check default map (only triggered once by char-server)
 * @param mapname
 */
void mapindex_check_mapdefault(const char *mapname) {
	mapname = mapindex_getmapname(mapname, NULL);
	if (!strdb_iget(mapindex_db, mapname))
		ShowError("mapindex_init: Default map '%s' not found in cache! Please change in (by default in) char_athena.conf!\n", mapname);
}

int mapindex_removemap(int index) {
	strdb_remove(mapindex_db, indexes[index].name);
	indexes[index].name[0] = '\0';
	return 0;
}

void mapindex_final(void) {
	db_destroy(mapindex_db);
}
